Recently, I get a phone call with a hidden number every day, at least once a day, most of the time at night, and then no one talks, only the rustling sound.

It may belong to VoIP, because VoIP will be transferred through the local transit server, so the number will not be displayed, and the attribution is different. It is unlikely to steal information unless the virus in your mobile phone automatically sends data. If your mobile phone has Internet, it is recommended to monitor traffic and data transmission. If there is no network, it is recommended to monitor whether the number of short messages has increased inexplicably. But it may also be harassing phone calls and offending people. Every night, someone bothers you with a VoIP phone, and you can't find the number. Moreover, if you receive silent harassing calls every night, you can call the police. If you don't want to call the police and can't stand it, then change the number.